The Era of Ancient Life.
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The main characteristic that distinguishes the fossil record of the Paleozoic Era from the Precambrian Era is the appearance of diverse and complex multicellular organisms in the Paleozoic Era. In the Precambrian Era, the fossil record primarily consists of simpler single-celled organisms. Additionally, the Cambrian Explosion, which occurred at the beginning of the Paleozoic Era, marked a significant increase in the diversity of life forms.
The Paleozoic Era.
No the formation of the moon could not have caused the Paleozoic Era to go extinct.
The 4 eras are Cenozoic era, the mesozoic era, the paleozoic era, and the precambrian era.
No, humans have not existed since the Paleozoic era. The Paleozoic era lasted from about 541 to 252 million years ago, and humans first appeared on Earth relatively recently, around 2 million years ago.